How do I lock my phone if someone knows the passcode and I change it if I don’t have it
Someone took my phone and potentially know the passcode how do I change it from a different phone or lock it so no one can get in it
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If you're talking about the passcode to unlock your device's screen, there's no way to change/reset it remotely, sorry.
If your iPhone was lost or stolen, these are the only steps you can perform:--> If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support , and/or:--> Use the Find My app to locate a missing device or item - Apple Support
Regards
Giulio